My profile: Correct text not in sidebar "About" widget

I've just noticed that the About widget in the sidebar on my blog is not showing the same text that's in the About Myself section of my user profile.

I've tried updating my profile; then deleting the About Myself content, updating my profile, and then pasting the correct text into About Myself, and updating again. Still no change in the content of About in the sidebar.

I have no idea how long this has been the case - I only tend to read the About widget when I change it.

It's not the end of the world, but it is mildly irritating. Any thoughts?